not sure if Biotest will appreciate me posting links to other products, apologize in advance.
this is by far the cheapest site ive ever found. i have the natures source dim and it works as well as the one i bought for $40+ (indoplex)
swansons house brand is great supplements also i use alot of them, but their calc-d is underdosed.
edit: yea they deleted links. just go on swansonhealthproducts and look for natures source dim and calc-d